package main

import (
	"fmt"
	"math"
	"math/rand"
	"time"
)

func main() {

	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	c3 := 0
	for i := 0; i < 100000; i++ {
		v := r.NormFloat64()*10 + 80
		if 0 <= v && v <= 100 {
			fmt.Println(math.Round(v))
			c3++
		}
	}
	fmt.Println("c3=", float64(c3)/100000)

}
